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Mitsubishi Electric Research Labs Raskar, Beardsley, vanBaar, Wang, Dietz, Lee, Leigh, Willwacher R F I G Lamps Change Detection without fixed camera, in any lighting condition Compare with new coordinates from a different view Record coordinates of tags from one view BeforeAfter

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Mitsubishi Electric Research Labs Raskar, Beardsley, vanBaar, Wang, Dietz, Lee, Leigh, Willwacher R F I G Lamps Towards Passive RFID Photosensor –Most compatible with passive batteryless RFID –Power: near zero power for sensing –Size: Each photocell is tens of micrometer (smaller than RFID which are about 500 micrometer) –Very low cost, can be built with silicon of RFID microchip –RFID+Photosensor can be size of grain of rice –RFIG tag is visible to projector but not to humans –Current prototype uses battery because passive tags are difficult to program Other possibilities –Adding a light emitting diode (LED) Requires on board power Size has to be considerably large Size and power requirements are high

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Mitsubishi Electric Research Labs Raskar, Beardsley, vanBaar, Wang, Dietz, Lee, Leigh, Willwacher R F I G Lamps 2. Select subset of tags for operation Advantages Only tags which are illuminated respond to queries No RF collision between multiple tags Projector also use as a display to indicate result of operation Technique Illuminate subset of tags with flashlight or projector 3. Long distance operation without RF collision

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Mitsubishi Electric Research Labs Raskar, Beardsley, vanBaar, Wang, Dietz, Lee, Leigh, Willwacher R F I G Lamps Futures We are used to fixed displays like desktops, laptops, and static projectors. Handheld devices with screens have become common over the last decade – but the displays are small. Handheld projectors offer a new display modality with its own characteristics - portable device size but with a large display. Add interaction to achieve the world as a desktop…